Question 1

Which oxide ore will yield the greatest number of grams of pure metal per kilogram of ore?

Accepted Answer

A) cassiterite,SnO2 
B) hematite,Fe2O3 
C) pyrolusite,MnO2 
D) rutile,TiO2 
A) cassiterite,SnO2 
B) hematite,Fe2O3 
C) pyrolusite,MnO2 
D) rutile,TiO2

Question 2

Which of the following metals occurs in nature principally as oxide ores?

Accepted Answer

A) Ca 
B) Co 
C) Cr 
D) Cu 
A) Ca 
B) Co 
C) Cr 
D) Cu

Question 3

The following pictures show the electron population of the bands of MO energy levels for four different materials.  
-Which of these materials has the highest electrical conductivity?

Accepted Answer

A) material (1) 
B) material (2) 
C) material (3) 
D) material (4) 
A) material (1) 
B) material (2) 
C) material (3) 
D) material (4)

Question 4

What is not a primary ingredient used in the production of iron by the blast furnace process?

Accepted Answer

A) coke 
B) iron ore 
C) limestone 
D) phosphates and silicates 
A) coke 
B) iron ore 
C) limestone 
D) phosphates and silicates

Question 5

Who discovered the phenomenon of superconductivity in 1911?

Accepted Answer

A) J)G.Bednorz 
B) R)B.Fuller 
C) K)A.M   ller 
D) H)K.Onnes 
A) J)G.Bednorz 
B) R)B.Fuller 
C) K)A.M   ller 
D) H)K.Onnes

Question 6

What is not part of the sol-gel process for the production of titania?

Accepted Answer

A) TiCl4 + 4 HOCH2CH3 + 4 NH3 → Ti(OCH2CH3)4 + 4 NH4Cl (in benzene) 
B) Ti(OCH2CH3)4 + 4 H2O → Ti(OH)4 + 4 HOCH2CH3 
C) (HO)3-Ti-OH + HO-Ti-(OH)3 → (HO)3-Ti-O-Ti(OH)3 + H2O 
D) 4 Ti(OH)4 + heat → 2 Ti2O3 + 8 H2O + O2 
A) TiCl4 + 4 HOCH2CH3 + 4 NH3 → Ti(OCH2CH3)4 + 4 NH4Cl (in benzene) 
B) Ti(OCH2CH3)4 + 4 H2O → Ti(OH)4 + 4 HOCH2CH3 
C) (HO)3-Ti-OH + HO-Ti-(OH)3 → (HO)3-Ti-O-Ti(OH)3 + H2O 
D) 4 Ti(OH)4 + heat → 2 Ti2O3 + 8 H2O + O2

Question 7

Picture (1)shows the electron populations of the bands of MO energy levels for elementary silicon.  
-Which picture (1)-(4)shows the electron populations when the silicon is doped with gallium?

Accepted Answer

A) picture (1) 
B) picture (2) 
C) picture (3) 
D) picture (4) 
A) picture (1) 
B) picture (2) 
C) picture (3) 
D) picture (4)

Question 8

The balanced chemical equation for the production of silver by roasting of its sulfide is ________.

Accepted Answer

Ag₂S(s)+ O₂(

Question 9

What element was found to be the first superconductor of electricity at 4.2 K in 1911?

Accepted Answer

A) copper 
B) iron 
C) gallium 
D) mercury 
A) copper 
B) iron 
C) gallium 
D) mercury

Question 10

What is the average oxidation number of Cu in the 1-2-3 superconductor YBa2Cu3O7 if Y is in the +3 oxidation state?

Accepted Answer

A) +2 
B) +2.33 
C) +3 
D) +3.33 
A) +2 
B) +2.33 
C) +3 
D) +3.33

Question 11

According to band theory,which one of the following metals is expected to have the highest melting point?

Accepted Answer

A) Cd 
B) Cr 
C) Hg 
D) Zn 
A) Cd 
B) Cr 
C) Hg 
D) Zn

Question 12

What is the Meissner effect associated with superconductors? It is ________.

Accepted Answer

A) when the temperature above which the superconductor fails to work 
B) when the temperature at which the superconductors become perfect insulators 
C) when the net magnetic field within the bulk of the superconductor is zero 
D) when the net magnetic field within the bulk of the superconductor becomes nearly infinite 
A) when the temperature above which the superconductor fails to work 
B) when the temperature at which the superconductors become perfect insulators 
C) when the net magnetic field within the bulk of the superconductor is zero 
D) when the net magnetic field within the bulk of the superconductor becomes nearly infinite

Question 13

Addition of a small amount of As impurity in silicon results in a(n)________-type semiconductor that has a conductivity that is ________ (greater,less)than silicon.

Accepted Answer

The answer of Addition of a small amount of As...

Question 14

During the production of iron,the formation of CaSiO3 (slag)from the reaction of CaO (lime)and SiO2 (sand),shown below,facilitates the separation of the iron from the gangue.
CaO(s)+ SiO2(s)→ CaSiO3(l)
In this reaction the acidic oxide is ________ and the basic oxide is ________.

Accepted Answer

Question 15

Which one of the following is an n-type of semiconductor?

Accepted Answer

A) alumina 
B) germanium doped with antimony 
C) germanium doped with boron 
D) tellurium 
A) alumina 
B) germanium doped with antimony 
C) germanium doped with boron 
D) tellurium

Question 16

The following pictures show the electron populations of the composite s-d bands for four different transition metals.  
-Which metal has the lowest melting point?

Accepted Answer

A) metal (1) 
B) metal (2) 
C) metal (3) 
D) metal (4) 
A) metal (1) 
B) metal (2) 
C) metal (3) 
D) metal (4)

Question 17

The principal source of chromium is chromite,FeCr2O4 in which chromium has an oxidation state of ________ and iron has an oxidation state of ________.

Accepted Answer

Question 18

The following pictures show the electron population of the bands of MO energy levels for four different materials.  
-Which of these materials has an electrical conductivity that remains constant with an increase in temperature?

Accepted Answer

A) material (1) 
B) material (2) 
C) material (3) 
D) material (4) 
A) material (1) 
B) material (2) 
C) material (3) 
D) material (4)

Question 19

Which metal has maximum filling of bonding molecular orbitals and minimal filling of antibonding molecular orbitals in its composite s-d band?

Accepted Answer

A) Au 
B) Cs 
C) Re 
D) W 
A) Au 
B) Cs 
C) Re 
D) W

Question 20

Which substance is the best conductor of electricity?

Accepted Answer

A) arsenic 
B) boron 
C) silver 
D) tellurium 
A) arsenic 
B) boron 
C) silver 
D) tellurium

Exam 21: Metals and Solid-State Materials

Which oxide ore will yield the greatest number of grams of pure metal per kilogram of ore?

Which of the following metals occurs in nature principally as oxide ores?

The following pictures show the electron population of the bands of MO energy levels for four different materials. -Which of these materials has the highest electrical conductivity?

What is not a primary ingredient used in the production of iron by the blast furnace process?

Who discovered the phenomenon of superconductivity in 1911?

What is not part of the sol-gel process for the production of titania?

Picture (1)shows the electron populations of the bands of MO energy levels for elementary silicon. -Which picture (1)-(4)shows the electron populations when the silicon is doped with gallium?

The balanced chemical equation for the production of silver by roasting of its sulfide is ________.

What element was found to be the first superconductor of electricity at 4.2 K in 1911?

What is the average oxidation number of Cu in the 1-2-3 superconductor YBa2Cu3O7 if Y is in the +3 oxidation state?

According to band theory,which one of the following metals is expected to have the highest melting point?

What is the Meissner effect associated with superconductors? It is ________.

Addition of a small amount of As impurity in silicon results in a(n)________-type semiconductor that has a conductivity that is ________ (greater,less)than silicon.

During the production of iron,the formation of CaSiO3 (slag)from the reaction of CaO (lime)and SiO2 (sand),shown below,facilitates the separation of the iron from the gangue. CaO(s)+ SiO2(s)→ CaSiO3(l) In this reaction the acidic oxide is ________ and the basic oxide is ________.

Which one of the following is an n-type of semiconductor?

The following pictures show the electron populations of the composite s-d bands for four different transition metals. -Which metal has the lowest melting point?

The principal source of chromium is chromite,FeCr2O4 in which chromium has an oxidation state of ________ and iron has an oxidation state of ________.

The following pictures show the electron population of the bands of MO energy levels for four different materials. -Which of these materials has an electrical conductivity that remains constant with an increase in temperature?

Which metal has maximum filling of bonding molecular orbitals and minimal filling of antibonding molecular orbitals in its composite s-d band?

Which substance is the best conductor of electricity?

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Nuclear Chemistry

Organic and Biological Chemistry

Filters

What is the average oxidation number of Cu in the 1-2-3 superconductor YBa₂Cu₃O₇ if Y is in the +3 oxidation state?

Addition of a small amount of As impurity in silicon results in a(n)-type semiconductor that has a conductivity that is (greater,less)than silicon.

During the production of iron,the formation of CaSiO₃ (slag)from the reaction of CaO (lime)and SiO₂ (sand),shown below,facilitates the separation of the iron from the gangue. CaO(s)+ SiO₂(s)→ CaSiO₃(l) In this reaction the acidic oxide is and the basic oxide is .

The principal source of chromium is chromite,FeCr₂O₄ in which chromium has an oxidation state of and iron has an oxidation state of .